The First Calcium(II) Complex With the Saccharinate Ligand: Synthesis, Crystal Structure, Spectral and Thermal Characterization of Trans-Diaquabis[(2-Hydroxyethyl)pyridinium]bis(Saccharinato)calcium Disaccharinate, [Ca(sac)2(H2O)2(hpyet)2](sac)2

Abstract

A new calcium(II) complex of the saccharinate ligand (sac) with 2-hydroxyethylpyridinium (Hpyet) was synthesized and characterized by elemental analysis, FT-IR spectroscopy, thermal analysis and single crystal X-ray diffractometry. The [Ca(sac)<inf>2</inf>(H<inf>2</inf>O)<inf>2</inf>(Hpyet) <inf>2</inf>](sac)<inf>2</inf> complex crystallizes in the triclinic space group (P1) with the cell dimensions a = 7.4360(7) Å, b = 12.5263(12) Å, c = 12.8329(13) Å, α = 82.534(8)°, β = 75.202(8)° and γ = 89.662(8)° (293 K). The title complex consists of a complex cation and two sac anions. In the complex cation, the calcium(II) ion is six-coordinate, bonding to two aqua ligands, two Hpyet ligands andtwo sac ligands located in the trans positions. Two of the sac ions are coordinated to the calcium(II) ion through the carbonyl O atom, while the other two remain outside the coordination sphere as the counter-ions. Thermal decomposition of the complex in air results in elimination of aqua, Hpyet, and sac ions, respectively.